1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why doesn't light go faster than it does?

  1. Mar 10, 2008 #1
    If it has no mass, what stops it from going arbitrarily fast? Why doesn't it have infinite speed?
  2. jcsd
  3. Mar 10, 2008 #2
    Permittivity & permeability properties determine e.m. wave speed.
  4. Mar 10, 2008 #3
    Check out [post=1556816]this excellent post[/post] on the subject by rbj.
  5. Mar 10, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper

    Try writing down a wave equation where the speed of propagation is infinite :p
  6. Mar 14, 2008 #5
    light is a special case .no mater what speed of light cannot be more than what it is.its a relativity concept.
  7. Mar 15, 2008 #6
    Actually, it's not just light - as rbj points out in the post I linked to E&M, gravity, nuclear interactions, etc. all travel at the speed of light.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook